How to check the fuel pump on a VAZ 2109 injector

You will need to consider the features that the VAZ 2109 fuel pump has. If the injector is in the fuel injection system, then the pump is of an electric type. Its use is due to the need to control the fuel supply to the combustion chambers. But, as you know, gasoline first enters a special ramp, in which it is mixed with air in a certain proportion (14 to 1). It maintains constant pressure, with the help of which the mixture is supplied to the combustion chamber through holes in the electromagnetic injectors. These are devices that transform the air-fuel mixture into very small droplets. Essentially, the mist in which the gasoline is suspended in the combustion chamber is ignited.

How does a fuel pump work?

There is nothing complicated about the fuel supply system. A conventional pump, which is driven by the rotor of an electric motor. To protect the entire fuel system from small particles, a filter is used. But this is not the end of the features, because it is worth noting that it is necessary to maintain the pressure in the ramp at the same level. And the VAZ 2109 fuel pump (the injector simply cannot work without it), provided that it constantly pumps gasoline, will begin to pump up the pressure higher and higher. And this will disrupt the operation of the system.

Therefore, it is necessary to adjust the pressure. For this, a special device is used, which is called a pressure regulator. It is installed in the fuel rail and connected to a pipeline that serves to dump excess gasoline into the tank. When the ignition is turned on, the rail pressure sensor is polled, after which the fuel pump drive is turned on. After the pressure in the rail has increased to the required value, the fuel pump is turned off. Therefore, it does not work all the time.

Preventing fuel pump breakdowns

The best prevention for long-term operation of the fuel pump is its careful and proper operation, as well as compliance with the following rules:

All scheduled vehicle repairs must be accompanied by the replacement of all fuel filters.
It is necessary to monitor and ensure the cleanliness of the fuel tank and filters, as well as monitor the quality of the fuel being refilled (the absence of water, sand and other impurities in it).
Eliminate the possibility of water getting into the fuel tank.
Protect the fuel pump housing from mechanical stress that causes dents and cracks that contribute to the development of corrosion processes.

How to remove the fuel pump

The VAZ 2109 fuel pump is located under the rear seat. The injector implies its installation directly in the tank. The thing is that the pump is a submersible type. In the same unit there is a float-type fuel level sensor. It works due to the fact that the float moves the slider using variable resistance. At the same time, the current in the power circuit changes. The amount of gasoline remaining in the tank is determined by the magnitude of the change. To remove the pump you will need to use pliers, screwdrivers and an 8mm wrench.

It is quite possible that the reason that fuel is not supplied is a non-working VAZ 2109 fuel pump relay. The injector contains it, as well as a fuse, which could easily burn out. Before starting work, thoroughly clean the entire cover so that after removal no dust gets inside the tank. Then, using a screwdriver, loosen the clamps that secure the hoses. Remove them; if you can’t do it with your hands, try gently squeezing them with pliers and twisting them. After this, use a size 8 wrench to unscrew all the nuts that secure the lid to the tank body. Please note that there are washers there. Don't lose them. That's all, now the pump can be easily removed for replacement or repair.

Causes of fuel pump failure

If the cause of the malfunction lies in the fuel pump, this does not always mean that it is faulty. The malfunction may be in one of its units and parts. For example, a fuse may blow. It is located in the fuse box, and its location may be different for each car. You can find out its location from the operating instructions. Most often it is located under the hood or to the left of the steering wheel on the driver's side.

The fuel pump, like any other device, wears out over time and fails. If there is a suspicion that the fuel pump is faulty, it should be diagnosed immediately.

Checking the pump's functionality

It is easy to check the VAZ 2109 fuel pump even without special instruments. The injector will not be able to operate without pressure in the fuel rail. Therefore, you need to keep the pump motor spinning. It’s easy to check; just connect its terminals to the battery. If you are afraid, then turn on an incandescent lamp in the gap of one wire. It will help determine the health of the motor winding. Please note that the filter must be as clean as possible. If it is clogged, be sure to change it. Otherwise, the pump will not be able to create the required pressure.

Features of the injection power system

The tasks of fuel pumps in carburetor and injection engines are somewhat different. If for a carburetor engine it is important to simply supply gasoline to the carburetor, then for an injection system this is not enough. The fuel pump must not only pump fuel from the tank to the ramp, but also create a certain pressure, without which the engine simply will not start.

Access to the fuel pump in injection cars is also complicated by the fact that in cars of recent years of production it is mounted together with a fuel receiver and a coarse filter directly in the gas tank. This complicates the diagnosis, repair and maintenance of the entire fuel module, but simplifies the design of the pump, since the gasoline itself lubricates and cools it. But this is precisely what often leads to unit breakdowns.

Pump installation

Pay attention to the condition of the wires when replacing the VAZ 2109 fuel pump. The injector involves powering the engine from the on-board network, so there should be no breaks or destruction of the insulation. Installation of the fuel pump is carried out in the reverse order of removal. First, place the body in the tank, landing on the studs. Then you need to tighten all the nuts, then put the hoses in place and connect the plug with the wires.

The car won't start, but when you turn the ignition key you can't hear the fuel pump running? Don’t rush to replace it with a new one; it’s better to first find out how to check the operation of the gas pump yourself.

Procedure : 1. Check the fuel pump fuse. This is where you should start checking the fuel pump. On a VAZ 2110 it is located near the left foot of the front passenger.

2. How to check the fuel pump relay. The relay is located next to the fuse, so let's check that right away. We check the voltage at the control terminals one by one (87, 86 and 85 in turn), and touch the ground with the other end. The testing tool can be a multimeter or a test lamp with a current consumption of no more than 0.25A. If the lamp does not light and the fuse is good, then we check the wiring and serviceability of the ECU.

Sometimes they check differently, for example, instead of a relay, they connect a test lamp between pins 85 and 86. When the ignition is turned on, the lamp should light up. You can also place a jumper between pins 87 and 30. Does the fuel pump start when you turn the key? This means the relay is faulty. You can also check the fuel pump relay by replacing it with a known good relay.

VAZ 2114 fuel pump relay where is it located

Dear visitors of the “Cars” website! We will be very grateful for your comments on the video clip “VAZ 2114 where is the fuel pump relay located?” registration is not required for this. We also ask you to let us know if you have any problems playing the video.

I had exactly the same problem, I also have it on gas, when the gas is turned on, the fuel pump gets very hot, so I need to make a toggle switch

Thank you very much, I fucked with this bitch today, and I didn’t even do that.

Tell me, who knows, my fuel pump doesn’t work, it doesn’t pump the gas, I installed a jumper, the fuel pump in the tank is moving, but it doesn’t want to ignite, what could it be?

It could be from the crankshaft sensor that one wire is torn, I don’t think it’s connected to the fuel pump

I have Lada Kalina gasoline in the morning, I turn on the ignition when it’s cold, the fuel pump doesn’t hum, and I connect the wire to the positive wire of the relay and the fuel pump directly and then I’ll warm it up and half a comb is like, then the fuel pump and heater will start working, the wiper will change the relay for me or from the engine, what are the sensors there?

hehehe. I didn't finish watching the video. ran to close up. I immediately installed the toggle switch. I came, I think, let me check it out. and you set the toggle switch.. I have a viburnum bonus. I close the contacts where you indicated, the pump is silent. I close + and it works from the brain. Where is this reason for the malfunction?

beautiful

Which wires did you connect to the relay socket? The numbers are there.

Hello. My fuel pump doesn’t make a sound, I did it directly and it doesn’t work either. And the fuel pump is new. what should I do, help me, it’s just too expensive to wait for service….

The pump squeals and the fuse near the switch burns out, what could it be?

What is the name of the relay that controls the operation of the fuel pump number? There are a lot of relays there, which ones exactly. thank you in advance.

why take minus another?? Is it possible to pull it from the plug again from the ecu? Or am I missing something???

The problem is, as stated here, the pump works, but it doesn’t. What could be the problem, where the circuit may be interrupted.

Tell me this is a problem with 2110, when you turn on the ignition, the fuel pump does not turn off after 3-5 seconds but works, sometimes the low and high beams also turn off, the tidy is on the go, the engine is running and sometimes stalls, tell me what to do, where to start?

the relay to which the gray wire goes,

I changed 3 p of the gas level float in the tank because of a short circuit the plug is on, but the nine is what it could be, tell me

Restoring the fuel line and replacing the fuel pump VAZ 2109

The VAZ 2109 fuel pump is an important component of the car. He is responsible for transporting gasoline along the fuel line from the gas tank to the engine compartment. The VAZ 2109 fuel pump injector is an electrical device, while in the carburetor version this element is mechanical.

Often the fuel pump is the reason the engine fails to start. The fuel injector or carburetor does not receive fuel in the required quantity, and the “nine” simply does not start. To understand the cause of the malfunction, you need to know the design of the pump, check all parts of the fuel pump for integrity and functionality.

Gasoline supply problems - common symptoms

Malfunctions of the fuel supply system are conventionally divided into 2 categories:

The combustible mixture is not supplied to the cylinders at all.
Gasoline is supplied intermittently or under insufficient pressure.

In the first case, the engine does not start and does not engage the starter during rotation, that is, it does not show signs of life. In such a situation, it is always easier to determine the cause of the breakdown.

When insufficient fuel enters the cylinders, the following symptoms appear:

starting the power unit “from cold” is very difficult, the engine seizes and “sneezes”, it starts in 3–10 attempts;
idling is unstable, the engine “troubles”;
dynamic acceleration becomes impossible - a sharp opening of the throttle causes a long dip and deceleration;
when the driver releases the accelerator pedal, the engine often stalls;
The car has difficulty climbing hills and accelerates slowly when fully loaded.

The cause of the above phenomena may be a malfunction of the fuel pump or other elements of the system, and the primary symptoms are almost the same. To carry out an accurate diagnosis, you need to understand how the car's power system works.

Checking the pump on the injection "nine"

The VAZ 2109 with an injection engine has an electric pump. It is powered by receiving voltage (12 V) from the battery. Its location is directly in the Lada gas tank. The mission of the electric pump is to deliver gasoline to the fuel rail under high pressure. Next, the fuel from the ramp enters the nozzles, which inject it into the combustion chamber.

If the injector on a VAZ 2109 does not pump the fuel pump, check the following elements:

fuel pump relay VAZ 2109;
fuse;
voltage to the pump;
wires from the mounting block to the pump;
pressure in the fuel rail.

A working fuel pump should start working when the engine starts. The sound of its operation should be heard under the rear seat. We begin the first stage of verification.

Possible situations and your actions

We take a voltage indicator and check the serviceability of the relay and fuse, which are located in the mounting block.

If the electrical circuit connection diagram is in order, you need to check the voltage supply directly to the pump. To do this, we dismantle the rear seat of the Lada 2109 car. Under it there is the top cover of the pump and the connected wire connector from the mounting block, and the fuel line hose is also supplied here. We disconnect the contacts and unscrew the bolts on the cover.

Now you have direct access to the pump. We remove the fuel pump from the gas tank.

We measure the voltage at the fuel pump using a multimeter (tester) or a 12-volt light bulb. If the device shows that voltage is supplied to the VAZ 2109 fuel pump, the problem is not electrical. This means that the fuel system should be checked. Well, if there is no voltage, you don’t have to worry about the pump malfunctioning. Just check the integrity of the wire leading from the mounting block to the pump for damage.

On a fuel-injected "nine", the fuel level in the gas tank should be maintained at least 10 liters. This is done to ensure that the fuel pump does not suck in air under any circumstances. We check the serviceability of the pump by measuring the pressure in the fuel rail.

We connect the device to a special hole in the ramp. If the voltage is normal and the pressure gauge shows no pressure, the problem may be in the fuel filter. We check its integrity and throughput. If the filter is working properly, we check the fuel line leading from the gas tank to the ramp.

If all these parts are in good working order, we conclude that the fuel pump itself has failed. Having replaced the pump with a new one, we connect it and try to start the car. If the car starts, the problem really was in the pump. If the engine fails to start, the fuel system should be checked more carefully.

In the absence of a pressure gauge, the performance of the gasoline pump is checked by the amount of gasoline pumped per unit of time.

This check can be performed by connecting a hose to the ramp and lowering it into a container. We wait and let the fuel flow into the container for one minute. Then we check the volume of fuel in the container. It should be from 0.5 to 1 liter.

Electrical diagram of VAZ 2110 features

Tuning Lada Vesta

Each VAZ-2110 car is equipped with electrical equipment, which is designed to ensure its operation and create comfortable conditions for the driver and passengers. All electrical appliances are integrated into a single network. To understand its composition and order of operation, an electrical circuit diagram of the VAZ-2110 was created. The on-board DC network has a voltage of twelve volts and includes energy sources and consumers, protective and distribution devices, wires and switching elements.

Current

The car has two sources of electricity - a battery and a generator. The first ensures the functioning of systems before start-up, during start-up and in some engine operating modes. The second is the main one and serves both to power all consumers and to charge the battery. The electrical circuit of the VAZ-2110 is designed in such a way that the power sources ensure energy balance in the system.

Motor

For the operation of the vehicle's power plant, timely supply of the fuel mixture and its ignition in the engine cylinders are necessary. On a modern car, this function is provided by the injection system. The electrical circuit of the VAZ-2110 (injector) allows you to correctly connect its two main components: the fuel distributor and the ignition control system. The injection is controlled by a special electronic unit. An uninterrupted supply of gasoline is ensured by an electric pump. It is installed directly in the fuel tank. The electrical circuit of the VAZ-2110 fuel pump is designed to meet fire safety requirements

Important note: Some brands of cars may have two fuel pumps installed. Previous VAZ car models used a carburetor fuel supply system

It is somewhat outdated, less economical and reliable. The electrical circuit of the VAZ-2110 allows you to connect a modern injector instead of the previous system without modifications. To change the fuel supply option, you must contact a specialist. For the engine to operate, its temperature must be maintained within the operating range. The cooling system is used for this purpose. It includes a fan and a number of sensors that operate on DC power.

Exploitation

A car is not just one smoothly running engine. To operate this type of vehicle, lighting, alarm, safety systems (active and passive), sound signal, and windshield wipers are vital. This list can be continued. All named devices are consumers of electrical energy. There are hundreds of them in a modern car from the Volzhsky plant. And any of them can fail for various reasons. The electrical circuit of the VAZ-2110 allows you to diagnose and eliminate any fault that may arise, and replace electrical wiring elements. Modern traffic rules prohibit the operation of vehicles if the above electrical devices do not work.

Comfort

The electrical circuit of the VAZ-2110 includes a number of devices that perform a service function. That is, they provide minimal comfort for the driver and passengers of the car. These are air conditioning systems, interior lighting, also a cigarette lighter, power steering, and radio. Cars from the Volzhsky plant are not famous for their increased comfort. However, the electrical circuit of the VAZ-2110 allows for some modifications, that is, tuning. To carry out this work, the help of a specialist is required. The vehicle wiring is reliably protected by a fuse block (inserts). It is they who, when shorted, do not allow all the wiring to burn out. Use only original products of the specified power. Keep some spare fuses with you. If any electrical appliance fails, first check the serviceability of the fuse links. In most cases, replacing the fuse will resolve the problem. That's all the information we wanted to share

We thank every reader for your attention.

Malfunctions of the pump with carburetor

Repairing the VAZ 2109 carburetor fuel pump should also begin with diagnostics. But in this regard, there is a significant difference from the injection version of the car. It lies in the fact that the fuel pump, in this case, is mechanical. The principle of operation, and therefore the repair, is different. Diagnosis involves the following basic steps when checked:

general condition of the fuel pump;
intake and exhaust valves;
tightness;
filter for clogging or damage;
pump diaphragm;
pusher

VAZ mechanical fuel pumps come in two types: DAAZ and Pekar. The principle of operation is similar, there are slight differences in design. The main parts of all mechanical pumps are: inlet and outlet valves, fittings, pusher, diaphragm and rod.

To check the inlet valve, you need to disconnect the hose from the suction fitting. Close the fitting with your finger and pump up the pump manually. If the finger is attracted to the valve, everything is in order - this part is serviceable; if not, the valve must be replaced. The outlet valve is checked by unscrewing the discharge fitting. By placing your finger in the same way and pumping up the lever, you should feel pressure.

Checking the fuel pump of a carburetor car (mechanical)

Mechanical fuel pump - diagram

To check the operation of the fuel pump, you should:

Remove the fuel hose from the carburetor inlet fitting.
Immerse the hose in a specially prepared transparent bottle. By actively using the pumping lever manually, we notice how strong and dense the fuel is supplied. Air impurities should not be visually noticeable.

Delayed jet output is not a sign of a breakdown, especially if the car has been parked for a long time. As a rule, diaphragms eight and nine are the main cause of malfunction.

Be that as it may, you need to inspect both the strainer and the inlet/outlet valve.

Even if the gaskets are replaced, fuel may leak. In this case, the problem lies in the tightness of the fuel pump housing due to deformation during repairs.

Mechanical fuel pumps of foreign cars are often a non-separable structure, so they cannot be repaired!

Let's summarize:

The causes of fuel pump problems, both electrical and mechanical, are varied, and the need to find/fix a breakdown may take you by surprise along the way. By following the above recommendations, you will be able to independently carry out the entire necessary set of measures to diagnose this device. And you should start with the power supply (if it is an electric fuel pump) and the operation of the diaphragm when checking a mechanical fuel pump. Very often, the unstable operation of a fuel pump is not due to its breakdown, but to related parts - a filter, check valve or injectors.

Checking the pump characteristics

As you can see, the main reasons for a non-working fuel pump are valves, filters, hoses, and diaphragms. At the outlet we get insufficient pressure. How to measure this pressure, and within what limits is the norm? Firstly, you need to know exactly the nameplate value of the output pressure to the carburetor of your car at idle speed. Approximately the indicator should vary from 0.2 to 0.35 atm.

Measurements are carried out using a pressure gauge with a division value of 1.6 atmospheres. If the pressure is not much less than normal, replacing individual parts may help solve the problem. But if there is a significant deviation, the VAZ 2109 fuel pump will most likely need to be replaced. Timely maintenance and rational use help to avoid this.

In addition to the pressure indicator, in order to repair a part, you should know the characteristics of the pump itself. If the linear parameters have changed, the tightness and stability of the entire mechanism may be impaired.

The rod must have a length of 82.4 mm and protrude above the gasket by no less than 0.8 mm and no more than 1.3 mm. The thickness of the closest gasket is 0.3 mm. The stroke of the rod should be in the range from 2.5 to 2.8 mm.

What is an injector - a modern replacement for a carburetor

An injector is a device that replaces the operation of a carburetor and consists of a fuel rail (rail) onto which injectors are attached. Under high pressure from the gasoline pump, fuel enters the rack, and from there the gasoline is distributed to the injectors. The injector nozzles, using rubber sealing rings, are inserted together with the rack into the engine block and inject fuel, which then ignites.

One of the main parts of the work in the injector is performed by the intake manifold. Its device includes a throttle valve, which is responsible for supplying air from the environment to the engine block.

An injector is a fairly thin device, the operation of which is constantly regulated by the electronic “brain” of the car. The presence of an on-board computer allows specialized car repair shops to carry out quick and accurate vehicle diagnostics. Diagnostics is carried out by connecting special equipment through a connector to the vehicle’s on-board computer.

Injection models of the VAZ 21099 since 2000 have also acquired electronic “brains”. This car model has front-wheel drive and shows high road stability. The engine of the injection 99 is four-cylinder, eight-valve, with a displacement of 1.5 liters. In a modern VAZ, the maximum speed indicated on the speedometer is 180 km/h. In practice, it is not recommended to accelerate this car over 160 km/h.

A design feature of a car injector is much lower fuel consumption compared to a carburetor car. VAZ 21099 (injector) has an average consumption of 7.0–7.5 liters per 100 km, at an average speed of 100–120 km/h. It was possible to achieve a reduction in fuel consumption by reducing the vehicle's energy consumption. It is worth noting that the injector of this car is not very picky about octane fuel and consumes the same gasoline, both A-92 and A-95.

Fuel pump VAZ 2109: how the injector works. Replacement and inspection

Replacing an electric fuel pump on a VAZ

Reduce pressure in the fuel supply system.
Using the fuel supply hose tip clamp, disconnect 2 hoses in turn.
Unscrew the 8 nuts around the circumference of the clamping ring and remove it.
A wire with negative polarity is attached to one of the nuts; it must be removed carefully.
We take the electric pump block out of the fuel tank, tilting it slightly, to keep the fuel level indicator sensor lever intact, otherwise it will produce incorrect parameters.
Remove the sealing rubber ring of the fuel block. If its properties are lost, the product must be replaced.
Install the pump in reverse order.

When installing fuel hoses, focus on the direction of fuel supply indicated by the arrows, and the installation arrow on the electric pump cover should point towards the rear of the car!

How does a fuel pump work?

Using a pressure gauge

If in the event of a malfunction with the electrical supply of the fuel pump, everything is clear - either it works or not, then mechanical wear is more difficult to determine. There are several techniques for this.

The fuel pump may be faulty for two reasons - mechanical and electrical.

You can estimate the fuel pressure if you unscrew the fuel rail plug and drain gasoline from the spool. There should be a powerful jet. Next, we unscrew the spool itself and connect a pressure gauge, preferably a fuel one, but you can also use one that measures the air pressure in the tires. Turn on the ignition and see how much the pump has pumped. It must be at least 280 kPa, on some models 380 - 400 kPa. To make it clearer, this is 3.8 - 4 kgf/cm2.

How to remove the fuel pump

Electrical circuit of the fuel pump in the injection VAZ 2110

The VAZ 2110 car with an injector system, even several years after the model was discontinued, is still very popular among car enthusiasts. The main reasons for this are the ease of maintenance and reliability of the machine. However, there are also negative aspects: the VAZ 2110 with an injector system very often has problems with electronics. The electrical circuit is quite complex for a Russian car and has 75 elements.

However, the weakest point is the fuel pump.

Its electrical circuit looks like this:

The main one is the fuel pump relay; all the necessary fuses are installed there.
Next, the electrical circuit diverges from one of the fuses to the diagnostic block and the device itself.
From the next to the main relay and injectors.
Next, the electrical circuit goes to the electronic control unit.
Also, the fuel pump electrical circuit goes to the battery.

Thus, it turns out that the VAZ 2110 with an injector, the pump contains 4 electrical parts. In case of failures related to the operation of the pump, they should be checked first.

Principle of operation

To make it easier for you to understand the electrical circuit of the 2110 with the injector system, let’s consider its structure and the principle of operation itself.

So, the following take part in the process:

Electronic control unit.
Relay for turning on the fuel unit.
Fuses that protect the electrical circuit of the device from overloads.

Wiring diagram VAZ 2110

In practice, the fuel unit starts working when the key is turned and ignites one turn. Before starting the engine, listen - at this moment you can hear the device starting to work and pumping gasoline.

Malfunctions in the electrical circuit

Now that you know the structure of the unit, let's figure out what to do if it malfunctions. So, if it shows no signs of life, the problem is most likely in burnt-out electrical parts.

You need to look for them not in the electrical unit, but directly in the interior of the VAZ 2110 with an injector system. The process looks like this:

First of all, find the fuses. They are located near the front console on the right passenger side. There you need to find the plastic shield and dismantle it. (The part is secured with three self-tapping screws).
There you will find three fuses and the same number of relays.
The relay located in the center feeds the fuel. To the left of it is the one that protects the injectors. It must be removed and checked for functionality. If the part is oxidized, clean the contacts. If there is no visible damage, the fuse may have blown and will need to be replaced.

If the above methods do not help, you should not interfere more actively with the electrical system of a VAZ 2110 with an injector system. Unknowingly you can only damage the car.

The fuel unit will stop working and then more expensive repairs will be required. Therefore, it is better to entrust the process to professionals.

Checking the pump's functionality

Diagnostics with pressure check

A more accurate diagnosis can be made by again measuring the pressure in the system. Each of the indicators below, or more precisely, a deviation from the norm, can signal certain problems with the pump:

In the case when, when the ignition is turned on, fuel does not enter the system and the pressure gauge is silent, most likely the problem is in the electronics - a relay or fuse. If the pump does not develop the required pressure during transient conditions, the coarse filter mesh is clogged. If the fuel return hose is pinched and the pressure is below 0.4 kPa, the pump is worn out.

Pump installation

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Malfunctions of VAZ 21099 - the injector also fails!

Regardless of the time of year outside, very often the car may simply stop starting, or begin to respond poorly to the gas pedal. In this case, all on-board computer sensors may not show errors. The causes of failure should be sought in the injector.

Usually the breakdown is associated with clogging of the fuel injector nozzles, which increases fuel consumption in the car and reduces traction. Due to the fact that the fuel does not enter in the quantity required for engine operation, the idle speed begins to float. For a VAZ, the normal value when the engine is idling in warm weather is 900 rpm. When starting in the cold season, the engine produces 1500 rpm; with proper operation, after 5–10 minutes they should drop to 900.

It is also worth paying attention to the throttle valve of the intake manifold - over time, black deposits appear on it, which prevents it from properly passing air. It is enough to clean the damper with a special spray and gently wipe with a cloth - the problem is eliminated!

Let's sum it up

Taking into account the above information, it becomes clear that the uninterrupted operation of the electric fuel pump of the VAZ 2110 or any other car will depend on correct and timely preventive maintenance, as well as on careful operation and compliance with certain rules.

We also recommend reading the article on how to change the fuel pump mesh with your own hands. From this article you will learn when and why it is needed, as well as how to replace the fuel pump strainer.

Only clean fuel should be poured into the tank and the fuel filter should be changed promptly. It may also be necessary to periodically change or clean the fuel pump strainer, use a moisture displacer from the gas tank, etc. Please note that it is not recommended to drive with an empty tank as the pump will not cool properly.

Finally, we note that in the event of malfunctions in the operation of the internal combustion engine, it is quite possible to diagnose and replace the fuel pump yourself in a regular garage (if you have the tools). However, working with the fuel system will require increased caution and compliance with all safety measures. If you are not confident in your abilities, it is better to turn to experienced specialists.

Problems with the operation of the vacuum type device

The vacuum pump may malfunction. This can happen for several reasons:

Problems	Causes	Solution
Insufficient vacuum	Insufficient oil level	Add oil to the required level
The oil has become dirty	Dirty engine. The higher the alkali content in the oil, the faster the engine cleans and the oil turns black.	Replace the oil with clean oil. If the alkali content is high, replacement is required after 5,000 kilometers.
The oil fill hole is clogged	Small particles on the surface of the lid	Clean the inlet and rinse the filter
The integrity of the hoses is compromised	Wear, mechanical damage, hose connection failure	Check hoses and their connections
Insufficient pump power	Loss of voltage from the generator to the pump due to unsuccessful implementation of standard wiring, insufficient device size	Replace the wiring or purchase a new part of the required power
Oil started leaking	The integrity of the oil container is damaged	Replace container
The cover of the hole for draining the oil does not fit well or the rubber ring has become unusable	The thread of the cover is torn off, the ring is worn out	Replace the cover and replace the gasket
Oil splashes	Permissible oil level exceeded	Drain some of the oil to the desired level
The pressure at the air evacuation fitting has been exceeded	Insufficient pump power	Install a more powerful pump
The pump is hard to start	The temperature has become too low	The device must be turned on and off several times in a row or the oil must be heated
Breakdowns in the electrical part of the pump	Voltage surges, short circuit	Check and eliminate breakdowns
Garbage has accumulated inside	Dirt in the gas tank	Examine the contents and remove the blockage, clean the gas tank

Pump repair or replacement?

There are two ways to get rid of a faulty power system. Firstly, it is expensive, but reliable - replacing the entire fuel pump with a VAZ 2107 carburetor. Secondly, installing a repair kit. Which is better? If your hands are full and you can do all the work perfectly, then, of course, it will be cheaper to install only new interiors. But if you are a driver who rarely encounters such difficulties, it is better to get a new device and install it on your car. Fortunately, the procedure is simple: you need to unscrew two nuts and loosen the clamps.

If the car engine does not start, various factors can be the cause of such consequences. One of these factors could be a gas pump, the main purpose of which is to pump gasoline into the engine from the gas tank. The VAZ 2107 has an injector and a fuel pump that is much more reliable than on carburetor cars. Despite this, even on fuel-injected cars the fuel pump can fail.

Repair of VAZ 21099 injector

In most cases, you can get by by simply cleaning the injector. This procedure can be done at every car service center. To prevent serious damage, have your car diagnosed in a timely manner. You can do the cleaning yourself using chemicals, but it will not be complete. If you decide to clean the injector yourself, you need to buy a repair kit for rubber O-rings for injectors and injector cleaning fluid.

Before performing this procedure, you need to remove the terminals on the battery and disconnect all power supply connectors near the injector. Then we proceed to remove the manifold, carefully unscrew and disconnect the pipes from it. After this, we release the pressure in the fuel rail of the injector by pressing the nipple on the left side of the rail.

Next, carefully move the sealing clamps from the injectors and, by swaying in different directions, remove our injector. It is not difficult to see whether the injectors are dirty. After disconnecting each nozzle, place them in a jar with a pre-prepared chemical mixture for 30–40 minutes. Once you have completed this procedure, we proceed to reassemble our fuel system in reverse order. Be sure to remember to change the o-rings on the injectors that come in the repair kit.

VAZ 2109 fuel pump malfunction, types of VAZ gasoline pumps

On a VAZ 2109, signs of a fuel pump malfunction are a complete or partial cessation of the supply of gasoline to the carburetor, this entails the inability to start both a cold and hot engine, it will start and stall, in addition, unstable idling is possible. If you suspect that the fuel pump in the VAZ 2109 is not working, then you should check it. It's not difficult to do it yourself, just read this article.

Causes: fuse, relay, connector

The pump power circuit includes many elements: closed relay contacts 5, fuse 3 (15 A), “+” wire, “pump-to-ground” wire. The most “difficult” defect is a short circuit of the “+” wire to ground. By the way, the cord itself is laid on metal, so such a defect cannot be ruled out.

Mounting block for dashboard

Both the relay and the fuse are located in a block located under the dashboard on the right. A fuse can blow in two cases:

The “+” cord makes contact with ground;
The motor resistance decreases due to overheating.

The first defect may be “floating”, and then it will be difficult to identify. But before calling an electrician, try checking everything else:

Relay 5 should click twice: when the ignition is turned on and after 1.5 s. If this does not happen, replace the relay;
Check fuse 3. If it is blown, you need to look for the cause.

Consider the situation: the relay is working, but the fuse is blown. Then we do this: disconnect the pump connector, install a new fuse and measure the voltage at the terminals. Details are below.

Connectors under the hatch, disconnecting them

You need to remove the hatch under the rear seat: two screws are unscrewed with a Phillips screwdriver. Next you need to disconnect the connector on the module, and then move on to the block under the dashboard.

First, turn off the fuel pump!

Replace the fuse. Let's move on to the fuel pump: connect the probe (zero cord) to any of the mounting studs. Voltage should appear on the “gray” wire when the ignition is turned on. And also check the potential difference between the “gray” and “black” wires - it should be equal to 12 volts, and also at the moment the ignition is turned on. Wiring:

The two outer cords are the FLS sensor;
“Black” – minus power supply;
"Grey" is a plus.

The "black wire" sometimes loses contact with ground. At the last step, we checked exactly this version.

There are reviews from owners that say: the fuel pump on a VAZ-2112 does not work if the electric motor is working properly and there is voltage in the connector. This happens when the contacts of the internal terminal block oxidize (see photo).

Internal connector - yellow

Getting to the connector on the motor is not easy - you need to remove the fuel pump module by unscrewing 8 nuts around the perimeter.

Diagnosing the fuel pump

Safety precautions

Before unscrewing the nuts, you need to disconnect the two hoses. But first try starting the engine. The power supply to the fuel pump is not connected.

Please note - the power is turned off here!

Everything is ready for dismantling if:

External connector is disabled;
It is impossible to start the engine, although the on-board network is not de-energized;
It is better if the tank is filled less than 50%!

You need to unscrew two fittings from the module cover (top photo). Then use a socket wrench to unscrew the nuts from the studs and remove the retaining ring.

There is very little left to the internal connector

Having gained access to the internal connector, you need to clean its contacts. Assembly is carried out in reverse order. Good luck!

Oxidation of the terminals of the internal connector is a typical disease of the VAZ-2112 fuel pump, and only one of the contacts does not work. The “+” terminal is more often oxidized.